CM6327A
USB Single-Chip Audio Solution for Mono Microphone
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Description and Overview
This is a highly integrated single-chip USB audio solution that is built for a wide range of USB audio
controller and applications. Based on our experiences designing and manufacturing PC USB Audio
peripherals, as well as recommendations from vendors, C-Media has designed this single-chip solution to
make it easier for vendors to integrate their products, and increase their revenues.
The CM6327A is C-Media’s new Audio SOC IC designed for advanced VoIP applications. It boasts a
high-performance mono ADC, as well as I2C interface, that allows for communication with various
microprocessors and DSPs. The CM6327A offers low-noise, high-quality speech input, important when it
comes to recording or broadcasting conference calls or public speeches.
The CM6327A integrates all essential analog modules, including 1-ch ADC, PLL, regulator and USB
transceiver modules, along with an EEPROM that allows you to customize the product string, PID and VID.
Sampling rates of 8/11.025/16/22.05/ 32/44.1 and 48 KHz, high-quality 16-bit resolutions and user-friendly
general purpose inputs and outputs for customized functions are supported. Many features can be
programmed using an external EEPROM and MCU, which are easily controlled via the HID software interface.
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Features
USB spec. 2.0 full speed-compatible and USB IF-certified
USB audio device class 1.0- and USB HID specification 1.1-compliant
Supports control/interrupt/isochroous data transfers
USB suspend/resume and remote wake-up support
Embedded USB transceiver and power-on reset circuit
Single 12MHz crystal input with on-chip PLL
Supports series number string for operation system detection
Serial EEPROM programming interface supports customized VID/PID/product and manufacture strings
for device name changes and configurations
EEPROM interface support 24C02 data format
Mono ADC input:
ADC sampling rate of 8K/11.025K/16K/22.05K/32K/44.1K/48KHz, and 16-bit resolution
Dynamic range: 96db, THD+N: -89~96db
Digital linear microphone gain control function (-16db~45db)
1.0Vrms input swing biased at 2.25V
Supports Microsoft HID functions
Supports I2C (master/slave) control interface for external controller used
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Copyright© C-Media Electronics Inc.
Rev. 2.0
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